[Tex/LaTex] Putting the symbol hat in math mode in LaTeX

math-modesymbols

enter image description here

How to put the hat in the above symbol in LaTeX?

Best Answer

I understand, that it is like some kind of Fourier transform of the whole expression. An alternative version added.

\documentclass{article}

\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}

\newcommand{\Sel}{\operatorname{Sel}}

\[
\Sel_{E}^{\Sigma_0}(\mathbb{Q}_\infty)_p{}\widehat{}
\]

But probably better

\[
(\Sel_{E}^{\Sigma_0}(\mathbb{Q}_\infty)_p)\,\widehat{}
\]

\end{document}

enter image description here

Related Solutions

[Tex/LaTex] Hat accent on bold greek letters in math mode

Plain TeX, and LaTeX, have a \skew macro which is described in the TeXBook.

\documentclass{article}
\usepackage{amsmath,amssymb,amsfonts,amsthm}
\usepackage{eulervm}

\begin{document}

\begin{tabular}{ll}
Normal: & a$\boldsymbol{\hat{\theta}}$b \\
\textbackslash skew-.5:   & a$\boldsymbol{\skew{-.5}\hat\theta}$b \\
\textbackslash skew-1:   & a$\boldsymbol{\skew{-1}\hat\theta}$b \\
\end{tabular}

\end{document}

skew hat

with \usepackage[T1]{fontenc} the hat moves: it is lowered and shifted a bit to the left of its non-T1 position.

skew bis

Hat over < symbol

I believe this should be reported as a bug in babel-spanish.

Anyway, since typing \widehat{<} is not really good because it will produce wrong spaces, you can use a workaround: define a command before the special action of babel-spanish enters the scene.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[spanish]{babel}

\newcommand{\lesshat}{\mathrel{\widehat{<}}}

\begin{document}

$a<b\lesshat c$

\end{document}

If you want to type \hat{<} or \widehat{<} in the body of the document, you can't unless you load

\usepackage[spanish,es-noquoting]{babel}

but, as I said at the beginning, this would produce wrong spacing because \hat{<} would be considered an ordinary symbol.

Thanks to Dan for pointing out that in a former version of the answer \string was not needed.

Best Answer

Related Solutions

[Tex/LaTex] Hat accent on bold greek letters in math mode

Hat over < symbol

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